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The molecular weight of CaCl2 can be determined by adding up the molecular weight of calcium and two times the molecular weight of chloride
= (40.08 + 2 * 35.45) g/mol
= 110.98 g/mol
For the molecular weight of CaCl2.9H2O, the molecular weight of CaCl2 must be added to nine times the molecular weight of water
= (110.98 + 9 * 18.02) g/mol
= 273.16 g/mol
So, to determine the number of grams in 7.5 g of CaCl2.9H2O,
= 7.5 * (110.98 / 273.16) g
= 3.05 g of CaCl2